Detect number entry on HP-35s?

[Thomas Radtke]

If you're about allowing the user to skip inputs, then you're on the wrong track. Choosing one of many variables can be done with indirect addressing, if that's all you want to accomplish. The operator would then have to state the variable number (you could add any offset if necessary) in I or J, and your program would INPUT(I) or INPUT(J).

hth